VLSI Technology, Inc.

VLSI Technology Inc, sometimes called VTI, were a maker of custom integrated circuits (ICs) including early chipsets for 80286 and 80386 motherboard manufacturers. In the 1980s PC market, they produced integrated chipsets that went up against Chips & Technologies, Headland and Suntac. Based in Silicon Valley, VLSI created their own chip fabrication plant in San Jose, CA, and later in San Antonio, TX. After initial successes with the 286 and 386 chipsets, they dropped out of the PC market when it became clear that Intel were combining their processors, chipsets and more into a cheap package-deal for the motherboard manufacturers. They then focussed on audio and graphics chipsets. VLSI Technology were acquired by Philips in 1999.

 

VL82C100 / VL82C101 / VL82C102 / VL82C103 / VL82C104

This was a five-chip chipset designed for 80286 motherboards up to 16 MHz. It consists of the following:

VL82C100-QC Peripheral Controller
VL82C101-QC System Controller (Bus control, Clock generation, Wait state control, DMA control)
VL82C102A-QC Memory Controller
VL82C103A-QC Address Buffer
VL82C104-QC Data Buffer

It was known to be used on the following motherboards:

 

VL82C201 / VL82C202 / VL82C203 / VL82C104

This was also a five-chip chipset designed for 80286 motherboards up to 12 MHz. It consists of the following:

VL82C100-20QC Peripheral Controller
VL82C201-20QC System Controller (Bus control, Clock generation, Wait state control, DMA control)
VL82C202-20QC Memory Controller
VL82C203-20QC Address Buffer
VL82C204-20QC Data Buffer

Note that this chipset is almost the same as the VL82C1xx 5-chip chipset, except this one is rated for use in up to 20 MHz system clock, and the system controller accepts a user-supplied PROCCLK or generates its own. It also accepts a 14.318 MHz crystal to control the video clock. The number right after the dash denotes the highest system clock the chip supports. The VL82C201 through 204 are available in 16QC and 20QC packages (16 and 20 MHz respectively).

Note this chipset still uses the same VL82C100 peripheral controller chip (there is no VL82C200).

It was known to be used on the following motherboards:

 

 

VL82C310 / VL82C311 / VL82C311L "SCAMP" Controller


The VL82C310/311/311L was a single system controller (not really a chipset as there's only one IC!) for 80286 and 386SX motherboards. SCAMP stood for "Single Chip AT, Mid-range Performance". For 286 systems it supported clock speeds up to 20 MHz. For 386 systems, both Intel 80386SX and AMD Am386SX CPUs were supported up to 25 MHz. For all systems it could address up to 16 MB of memory. The chipset integrated two DMA controllers, two interrupt controllers, a memory mapper, a timer, a clock generator and bus controller. It could optionally be coupled with an external VL82C325 cache controller on 386SX motherboards to improve system performance, or VL82C107 [Notebook] or VL82C113 [Desktop] I/O chips. It was released in January 1992. The chips in this range were as follows:
VL82C310 - For Notebook PCs: includes "Sleep mode" instructions to allow a computer to minimise power consumption and maximise battery life in portable systems.
VL82C311 (386SX) or VL82C311L (80286) - for Desktop PCs.

There are several examples of motherboards that use this chipset on my 386 Motherboards page.

Click here for the datasheet

 

VL82C315 "SCAMP II" Chipset


The VL82C315 was a single system controller for 386SX, 386DX, 486SX and 486DX computers. It was released in late 1992. For desktop applications (5V) it supported clock speeds up to 33 MHz. For notebooks (3.3V) which was its primary intended market due to its low power mode functions, it supported up to 25 MHz clocks. The single chip replaced the need for two DMA controllers, a memory mapper, two interrupt controllers, a timer, clock generator, bus controller, keyboard controller and RTC (realtime clock). Like the VL82C310, it could access up to 16 MB of system memory. This controller was compatible with the VL82C3216 cache controller for 386DX/486DX systems, and with VL82C325 on 486SX systems.

Click here for the datasheet

 

VL82C320 "TOPCAT" Chipset


The VL82C320 was a 2-chip chipset for 80286 and 386SX motherboards that run CPUs from 12 to 25 MHz (up to 20 MHz for 80286 systems). It could access up to 32 MB of system memory, and was designed to run a motherboard's ISA bus at up to 12 MHz.
The chipset consists of the following ICs:

    VL82C320 or VL82C320A - System Controller and Data Buffer
    VL82C331 - ISA Bus Controller
    VL82C335 - "Look-aside" Cache Controller [optional]
Click here for the Product Bulletin

 

VL82C330 "TOPCAT" Chipset


The VL82C330 was a 3-chip chipset designed for 386DX motherboards running from 16 MHz up to 33 MHz. It could access up to 64 MB of system memory.
The chipset consists of the following ICs:

    VL82C330 or VL82C330A - System Controller
    VL82C331 - ISA Bus Controller
    VL82C332 - Data Buffer
    VL82C335 - "Look-aside" Cache Controller [optional]
Click here for the Product Bulletin